--- ray/doc/man/man1/rcalc.1	2003/12/09 15:59:06	1.4
+++ ray/doc/man/man1/rcalc.1	2004/06/09 16:00:12	1.6
@@ -1,4 +1,4 @@
-.\" RCSid "$Id: rcalc.1,v 1.4 2003/12/09 15:59:06 greg Exp $"
+.\" RCSid "$Id: rcalc.1,v 1.6 2004/06/09 16:00:12 greg Exp $"
 .TH RCALC 1 4/6/99 RADIANCE
 .SH NAME
 rcalc - record calculator
@@ -9,6 +9,8 @@ rcalc - record calculator
 ][
 .B \-l
 ][
+.B \-p
+][
 .B \-n
 ][
 .B \-w
@@ -67,6 +69,19 @@ or
 options do not require a count, as this will be determined by the
 number of output channels in the given expressions.
 .PP
+The
+.I \-p
+option specifies "passive mode," where characters that do not
+match the input format are passed unaltered to the output.
+This option has no effect unless
+.I \-i
+is also specified, and does not make much sense unless
+.I \-o
+is also given.
+With both input and output formats, the passive mode can
+effectively substitute information in the middle of a file
+or stream without affecting the rest of the data.
+.PP
 The variable and function definitions in each
 .I \-f source
 file are read and compiled.
@@ -283,4 +298,4 @@ options, not in definitions.
 .PP
 Tabs count as single spaces inside fields.
 .SH "SEE ALSO"
-calc(1), cnt(1), ev(1), getinfo(1), lam(1), tabfunc(1), total(1)
+cnt(1), ev(1), getinfo(1), icalc(1), rlam(1), tabfunc(1), total(1)